Learning Goal: To analyze the forces within space truss members and the reaction forces that act on space trusses. A space truss is a stable three-dimensional structure that consists of members joined at their ends. If the external loading is applied at the joints, and the joints are ball- and-socket connections, the members of a space truss may be treated as two-force members. A space truss is subjected to a load of F = {110i - 410k} lb (Figure 1) Three ball-and-socket joints at C, E, and G support the space truss. If F =110 lb, F = 410 lb in the negative z direction, and d = 9.00 ft, what is the magnitude of the force in member AC? Indicate a tensile force as a positive value and a compressive force as a negative value. Express your answer numerically to three significant figures in pounds. ▸ View Available Hint(s) FAC 110 lb Figure 1 of 2 Submit Previous Answers Part B Correct As shown, a space truss is the frame for a building's awning. (Figure 2) Three ball-and-socket joints at A, B, and E support the frame. If a force of F = {180i + 380j} N is applied at point D, what are the forces in each member? Indicate a tensile force as a positive value and a compressive force as a negative value. Express your answers numerically to three significant figures in newtons separated by commas. ▸ View Available Hint(s) ΜΕ ΑΣΦΑ vec ? FDA FDC, FDB, FCA, FCB, FCE = 240, 240,180,380, -315,480 B Submit Previous Answers × Incorrect; Try Again; 5 attempts remaining N